Constant bladder pressure and need to urinate

Over the last five days, I have suddenly had an onset of extreme bladder pressure and a frequent need to urinate. I am a 20 yr old female who is in otherwise great health, other than I have vasovagal syncope (but very rarely).

I feel no burning or pain when urinating, but I have a constant feeling that my bladder is full and that I am unable to empty it all the way. I am pretty sure this is not a UTI, because antibiotics have no effect. I have also taken ditropan, which not only does not help but seems to exacerbate the problem.

Several days before this occurred, I had a bout of something completely different, which has happened before: I was getting up every hour to use the bathroom urgently, but I would urinate a great deal, and my bladder would feel fully empty when I was done. Now, it's like the exact opposite.

I am very miserable. I always have to be near a bathroom, and I constantly feel pressure and a desperate need to urinate even though I cannot. I can urinate, although I do not seem to be fully emptying my bladder. I desperately need some suggestions. Thank you very much.

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